Tarnish and waterproof fabric



Pate/uteri Mar. 16, 1937 PATENT OFFICE ac-lasso ranmsn warsaraoor mnaro Arthur D. Champlin, Providence, 3. I.

No Drawing.

. 10 Claims. My invention relates to improvements in fabrics adapted for use in protecting articles having:

a metal surface subject to tarnishing whether they be used for actually wrapping said articles 10 shown in Patent No. 1,949,791, issued March 6,

1934, to me; Patent No. 1,766,646, issued June 24, 1930, to Grinnel Jones; Patent No. 1,628,610,

issued May 10, 1927, to Fay Osborne; Patent 1,933,302, issued Oct. 31, 1933, to Walter G. Aur- 15 and and many others. While these substances have been somewhat efllcient in preventing the tarnishing of silver, they have been somewhat lessened in their efficiency because they have failed to prevent the access to said article of moisture or water, which tends to collect on the surface of said article and be a reservoir for the absorption of the tarnishing gases, such as hydrogen sulphide, present in the air.

I believe I am the first therefore to provide 25 an article which is not only chemically treated to render it tarnish proof, but also additionally treated to render it moistureproof or water proof to positively prevent this gas absorbent reservoir from'forming on the surface of the article to be protected. In the preferred embodiment of my invention I preferably impregnate the pores of the fibres with the tarnish proofing chemical and then permanently entrain it within the saidpores by impregnating a water proofing substance within said pores. This performs a double function of not only positively keeping out all dampness, moisture or water from the surface of the article desired to be protected, but also tends to permanently entrain the tarnish proofing chemical within the pores of the fibres so that it will remain in the pores of the fabric over a relatively longer time than formerly to maintain' its tarnish'proofing efliciency over a much greater period of time.

While any type of fabric may be employed'for wrappingthe article having a silver or other metal surface subject to tarnishing, I preferably employ a textile fibre woven fabric as I find this more readily absorbs both the tarnish proofing 50 chemical and water proofing substances. While I preferably employ a pile or napped fabric having a smooth surface adjacent the surface of the article desired to be protected, I may if desired,

provide an unnapped fabric of any desired weave. 55 I then suitably impregnate this fabric so that the Application August 29, 1935, Serial desired tarnish proofing reagent may be absorbed in the fabric by passing it through a padding machine, spraying it on, soaking it in or in any ofthe other ways known in the trade. Any

suitable type of tarnish proofing chemical or chemicals preferably a metal salt or salts may be employed, such as the mixture of aluminum sulphate, borax and sodium sulphate shown in my former Patent No. 1,949,781, any suitable pref erably soluble salt, such as acetate of lead, cadmium, zinc, copper, aluminum, iron, nickel, sil- .ver, etc., or the metal salts may, if desired, be in sulphate, oxide or anyother suitable, preferably soluble, form. While roughly I may employ about one-half pound of soluble tarnish proofing salt to a gallon of water, it is obvious that the amounts may be varied according to the nature of the salt employed and the fabric being treated.

After the fabric has been treated with chemical tarnish proofing reagent to render it sub- 29 stantially tarnish proof, I then permanently retain said chemical within the pores of said fabric by'treating it with a substance rendering said fabric water, damp or moisture proof. While any suitable type of water proofing material may be employed I preferably employ a wax, such as Japan wax, carnauba, paraflin wax, etc. I prefer the action of waxes as they not only tend to give a coating to each surface of the fabric, but also tend to fill up the cells of the fibres 30 with a substance through which water can not penetrate. I preferably apply the wax to the fabric by dissolving it in a suitable solvent, such as petroleum spirit, carbon bisulphide, benzene. etc. .I then remove the solvent from said wax to impregnate'the fibre cells with wax to render said fabric water proof and damp proof and permanently retain the tarnish proofing chemical within the pores of said fabric. I prefer an amount of wax suitably to leave from 3 to 6% by weight 49 of wax in the finished fabric. While I preferably employ wax, it is apparent, however, that other suitable types of water proof reagents. such as acetate of alumina may be employed. This may besuitably prepared by dissolving 4 lbs. of alum in 8 gallons of water to provide a solution of alum and mixing this with 8 gallons of a solution of 4 lbs. of acetate of lead to precipitate out sulphate of lead and leave the acetate of alumina in the solution. The fabric is then soaked in a the solution of acetate of alumina and then dried. The drying operation decomposes the acetate of alumina, leaving aluminum oxide AlzOa deposited inan insoluble form in the pores of the fibres. This process renders the fabric water proof with- I.

out affecting its penetrabiiity by air and without affecting its color softness or texture. I prefer, however, to employ the wax as this positively prevents any gaseous material from attaching 5 the metal surface of the article desired to be protected. It is apparent that any other suitable type of moisture proofing, tarnish proofing or water proofing materials may be employed. If desired the fabric may first be preliminarily 1o dyed or otherwise treated in a manner to substantially remove all sulphur chlorides and sulphates from the fabric prior to its tarnish proofing and water proofing treatments.

It is thus apparent that I have provided a novel type of tarnish proofing fabric more efficient in its action than any hitherto provided in that it positively prevents water, vapor, dampness or moisture from reaching the surface of the metal article desired to be protected in pure form or having absorbed therein tarnishing gases or reagents, such as H28 and positively prevents the building up of a reservoir on the surface of the article desired to be protected absorbent to tarnish proofing gases.

It is understood that my invention is not limited to the specific embodiment described and thatgvarious deviations may be made therefrom without departing from the spirit and scope of the appended claims.

80 What I claim is: 1

1. A fabric for use in protecting articles having a metal surface subject to tarnishing comprising a fabric consisting of spaced interwoven threads, the cells of the fibres in each thread 85 being partially impregnated with a chemical means rendering said fabric substantially tarnish-proof, saidcells being supplementally impregnated with a sufficient amount of a substance rendering said fabric substantially waterproof to so attendantly retain said tarnish proofing chemical means within said cells in positions to absorb materials in the air tending to cause tarnishing.

2. A fabric for use in protecting articles having a metal surface subject to tarnishing com- 5 prising a fabric consisting of spaced interwoven threads, the cells of the fibres in each thread being partially impregnated with a metal salt rendering said fabric substantially tarnish-proof, said cells being supplementally impregnated with 50 a sufficient amount of a substance rendering said fabric substantially waterproof, to attendantly retain said tarnish proofing metal salt within said cells in positions to absorb materials in the .air tending to cause tarnishing.

3. A fabric for use in protecting articles having a metal surface subject to tarnishing comprising a fabric consisting of spaced interwoven threads, the cells of the fibres in each thread being partially impregnated with a chemical means rengo dering said fabric substantially tarnish-proof,

said cells being supplementally impregnated with a sufficient amount of a wax rendering said fabric substantially waterproof to attendantly retain said tarnish proofing chemical means within said 5 cells in positions to absorb materials in the air tending to cause tarnishing.

4. A fabric for use in protecting articles having a metal surface subject to tarnishing comprising a fabric consisting of spaced interwoven 7 threads, the cells of the fibres in each thread being partially impregnated with a metal salt rendering said fabric substantially tarnish-proof, said cells being supplementally impregnated with a sufllcient amount of a wax rendering said fabric substantially waterproof to attendantly retain said tarnish proofing metal salt within said cells in positions to absorb materials in the air tending to cause tarnishing.

5. A fabric for use'in protecting articles having a metal surface subject to tarnishing comprising 5 a fabric consisting of spaced interwoven threads,

' the cells of the fibres in each thread being partially impregnated with a metal salt rendering said fabric substantially tarnish-proof, said cells being supplementally impregnated with 3 to 5% 1.0

each thread of said fabric consisting of spaced 20.

interwoven threads with a chemical means ren- 1 dering said fabric substantially tarnish-proof and then supplementally impregnatingsaid cells of the fibres in each thread with a sufficient amount of a substance rendering said fabric substan- 25 tially water-proof to attendantly retain said tarnish-proofing chemical means within said cells in positions to absorb materials in the air tend-,- ing to cause tarnishing.

7. The improved process of u proof and tarnish proof fabric for use in wrapping or case lining articles having metal surfaces subject to tarnishing which comprises chemically partially impregnating the cells of the fibres in each'thread of said fabric consisting of spaced interwoven threads with a metal salt rendering said fabric substantially tarnish proof and then supplementally impregnating said cells of the fibres in each thread with a suificient amount of a substance rendering said fabric substantially 4o water-proof to attendantly retain said tarnish proofing metal salt within said cells in positions to absorb materials in the air tending to cause tarnishing.

8. The improved process of making a water 'proof and tarnish proof fabric for use in wrapping or case lining articles having metal sin'faces subject to tarnishing which comprises chemically partially impregnating the cells of the fibres in each thread of said fabric consisting of spaced interwoven threads with a chemical means rendering said fabric substantially tarnish-proof and then supplementally impregnating said cells of the fibres in each thread with a sufficient amount of a wax rendering said fabric substantially 5 water-proof to attendantly retain said tarnish proofing chemical means within said cells to absorb materials in the air tending to cause tarnishing.

9. The improved process of making a water proof and tarnish proof fabric for use in wrapping or case lining articles having metal surfaces subject to tarnishing, which comprises chemically partially impregnating the cells 'of the fibres in each thread of said fabric consist- 5 ing of spaced interwoven threads with a metal salt rendering said fabric substantially tarnish proof and then supplementally impregnating said cells of the fibres in each thread with a sufficient amount of a wax rendering said fabric substantially water-proof to attendantly retain said tarnish proofing metal salt within said cells in positions to absorb materials in the air tending to cause tarnishing.

10. Thev improved process of makings water proof and tarnish proof fabric for use in wrapsupplementally impregnating said cells of the ping or case lining articles having metal surfaces fibres in each thread with 3 to 5% of wax rendersubject to tarnishing which comprises chemically ing said fabric substantially water-proof to atpartially impregnating the cells or the fibres in tendantly retain said tarnish proofing metal salt 5 each thread of said fabric consisting ofspaced within said cells in positions to absorb materials 5 interwoven threads with a metal salt rendering in the air' tending to cause tarnishing; said fabric substantially tarnish-proof and then ARTHUR D. CLIN.

" CERTIFICATE or connection.

Patent No, 2,075,730. r March 16,- 1927.

ARTHUR D. CHAMPLIN.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring'correction as follows: Page 2, first column, line .4, for "attaching" read attacking and that the said. Letters'Patent' should bereadwith this cqrrectiontherein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 1st day of June, A. D. 1957. f

. .Henry Van Arsdale (Seal) I Aeting Commissioner. of Patents. 

